CeO2 Component Research Articles

Enhanced carbon monoxide poisoning resistance of Pd/BEA by integrating with CeO2 for low temperature NO adsorption: The role of CeO2 on oxidizing carbon monoxide to CO32−

Passive NOx adsorption (PNA) represents a promising technology for controlling NOx emissions during cold starts. However, Pd/zeolite catalysts, the latest generation of PNA materials, suffer from serious deactivation under CO concentrations, owing to the CO induced aggregation of highly dispersed Pd sites to PdO particles. In this work, we found that the resistance to CO poisoning of Pd/BEA can be enhanced by integrating with CeO2 through physical mixing. The resulting CeO2 + Pd/BEA composite catalyst demonstrated a notably higher NOx storage capacity (with a NOx/Pd ratio of 1.3) compared to Pd/BEA (0.8). This improvement can be attributed to the interaction between CeO2 and the BEA support, which promoted the formation of nitrates on CeO2 during NO adsorption at 80 °C. More importantly, CeO2 effectively shielded Pd2+ ions from reduction by CO, with 88 % of Pd2+ ions remaining after CO exposure, significantly outperforming Pd/BEA, which retained only 66 %. Spectra characterization and DFT results indicate that the defects in CeO2 strongly trapped CO (−0.973 eV), and the oxidation of trapped CO to CO32− by adsorbed oxygen (Oads) was exothermic (−1.35 eV), which reduced the exposure of Pd2+ ions to CO and inhibited the reduction and agglomeration of Pd2+ ions. While the composite sample still exhibited a slight reduction in NOx storage capacity after CO poisoning, with the NOx/Pd ratio decreasing from 1.3 to 0.9. The DFT simulation results indicate that the Ce-Oads bonds in CeO2 are weakened during the decomposition of the CO32− intermediate. This weakening could potentially facilitate the release of Oads, thereby reducing the Oads content as evidenced by spectral evidence. The decrease of Oads diminished nitrate formation on the CeO2 component in composite sample, resulting in the decline of NOx storage capacity after CO poisoning.

Triangle CeO2/g-C3N4 heterojunctions: Enhanced light-driven photocatalytic degradation of methylparaben

In this work, an efficient photocatalytic system for methylparaben (MP) removal, using solar (λ > 360 nm) and visible (λ > 420 nm) light-driven CeO2/g-C3N4 (CeO2/CN) heterojunctions is reported for the first time. The physicochemical properties of pure CeO2, CN, and CeO2/CN composites were investigated using characterization techniques, such as XRD, FESEM-EDS, TEM, UV–Vis, PL, XPS, and electrochemical spectroscopy. Among the catalysts with different mass ratios of CeO2, 10 %CeO2/CN showed the best photocatalytic performance. This is attributed to the enhanced charge carrier’s separation because of the proper band-edge alignment between CN and CeO2 components, and the strong visible light absorbance. The photocatalytic degradation of MP followed the first-order kinetics, and the 10 %CeO2/CN catalyst exhibited a 3.8- and 11.3-times higher reaction rate (k) constant than that of pure CN, investigated under solar and visible light illumination, respectively. Further, scavenger trapping experiments confirmed that hydroxyl radicals (OH.) and dissolved oxygen are the predominant active species in MP oxidation over 10 %CeO2/CN composite catalyst. 1H NMR and LCMS-HPLC results and observations showed complete degradation of MP (0.1 g/L) to CO2 and H2O after 7 h of solar irradiation, due to the absence of the representative peaks of MP and its organic degradation products (e.g. phenols, benzoates).

A multifunctional solution to enhance capacity and stability in lithium-sulfur batteries: Incorporating hollow CeO2 nanorods into carbonized non-woven fabric as an interlayer

Lithium-sulfur batteries (LSBs) hold promise as the next-generation lithium-ion batteries (LIBs) due to their ultra-high theoretical capacity and remarkable cost-efficiency. However, these batteries suffer from the serious shuttle effect, challenging their practical application. To address this challenge, we have developed a unique interlayer (HCON@CNWF) composed of hollow cerium oxide nanorods (CeO2) anchored to carbonized non-woven viscose fabric (CNWF), utilizing a straightforward template method. The prepared interlayer features a three-dimensional (3D) conductive network that serves as a protective barrier and enhances electron/ion transport. Additionally, the CeO2 component effectively chemisorbs and catalytically transforms lithium polysulfides (LiPSs), offering robust chemisorption and activation sites. Moreover, the unique porous structure of the HCON@CNWF not only physically adsorbs LiPSs but also provides ample space for sulfur’s volume expansion, thus mitigating the shuttle effect and safeguarding the electrode against damage. These advantages collectively contribute to the battery’s outstanding electrochemical performance, notably in retaining a reversible capacity of 80.82 % (792 ± 5.60 mAh g−1) of the initial value after 200 charge/discharge cycles at 0.5C. In addition, the battery with HCON@CNWF interlayer has excellent electrochemical performance at high sulfur loading (4 mg cm−2) and low liquid/sulfur ratio (7.5 µL mg−1). This study, thus, offers a novel approach to designing advanced interlayers that can enhance the performance of LSBs.

Photo-assisted electrocatalysis of NiO/CeO2 heterojunction for efficient oxygen evolution reaction

In recent years, photo-assisted electrocatalysis has attracted significant interest in the field of electrolytic hydrogen production. By integrating electrical and optical energy, supplementary energy is harnessed for the electrocatalytic process, which offers an efficient strategy to enhance the performance of oxygen evolution reaction (OER). Herein, the heterojunction NiO/CeO2 composite nanostructures supported by nickel foam (represented as NiO/CeO2@NF) was selected as the photo-assisted electrocatalyst, through the mutual synergy of voltage and light to improve the catalytic activity of OER in electrolytic water. Under light irradiation, the NiO component undergoes photoexcited to produce photogenerated electrons that move towards the CeO2 component, stimulating the generation and accumulation of more holes accelerating the formation of Ni (III) to improve the reaction efficiency with electrons, thereby boosting the enhancement of OER activity. The results demonstrate that the overpotential corresponding to NiO/CeO2@NF in non-irradiation at 10 mA cm−2 current density was 280 mV, and the NiO/CeO2@NF in light irradiation displays robust OER activity, with lower over-potentials 260 mV at 10 mA cm−2, which 20 mV lower than in non-irradiation. Moreover, NiO/CeO2@NF in light irradiation exhibits high catalytic activity and durability for OER in an alkaline electrolyte, delivering 100 mA cm−2 at 320 mV and outperforming RuO2 under high current densities.

Pd-Ceria/CNMs Composites as Catalysts for CO and CH4 Oxidation.

The application of composite materials as catalysts for the oxidation of CO and other toxic compounds is a promising approach for air purification. In this work, the composites comprising palladium and ceria components supported on multiwall carbon nanotubes, carbon nanofibers and Sibunit were studied in the reactions of CO and CH4 oxidation. The instrumental methods showed that the defective sites of carbon nanomaterials (CNMs) successfully stabilize the deposited components in a highly-dispersed state: PdO and CeO2 nanoparticles, subnanosized PdOx and PdxCe1-xO2-δ clusters with an amorphous structure, as well as single Pd and Ce atoms, are formed. It was shown that the reactant activation process occurs on palladium species with the participation of oxygen from the ceria lattice. The presence of interblock contacts between PdO and CeO2 nanoparticles has an important effect on oxygen transfer, which consequently affects the catalytic activity. The morphological features of the CNMs, as well as the defect structure, have a strong influence on the particle size and mutual stabilization of the deposited PdO and CeO2 components. The optimal combination of highly dispersed PdOx and PdxCe1-xO2-δ species, as well as PdO nanoparticles in the CNTs-based catalyst, makes it highly effective in both studied oxidation reactions.

Enhanced Energy Storage Performance of AgNbO3:xCeO2 by Synergistic Strategies of Tolerance Factor and Density Regulations

AgNbO3-based ceramics have been widely studied as ideal lead-free materials. Herein, AgNbO3:xCeO2 (x = 0, 1, 2 mol%) ceramics were successfully prepared by the conventional solid-state reaction method. The optimization of energy storage properties is ascribed to the enhanced antiferroelectric (AFE) stability and the increased breakdown strength (Eb). The reduction of the tolerance factor leads to the enhancement of AFE stability. In addition, the enhancement of Eb is due to the increase of actual density, which is achieved through the regulation of CeO2 amount and grinding procedure in the experimental process. A high recoverable energy density (Wrec) of 5.04 J/cm3 and an energy efficiency (η) of 46.2% were achieved in AgNbO3:0.01CeO2 ceramics under an applied electric field up to 390 kV/cm. A higher η of 55.4% was obtained in AgNbO3:0.02CeO2 components. This research provides guidance for finding ceramic materials with comprehensive energy storage properties.

Engineering the Mechanically Mixed BaMnO3-CeO2 Catalyst for NO Direct Decomposition: Effect of Thermal Treatment on Catalytic Activity

A 5 wt% BaMnO3-CeO2 composite catalyst prepared by the one-pot method exhibits extraordinary catalytic performance for nitrogen monoxide (NO) direct decomposition into N2 and O2; however, the reasons for the high activity remain to be explored. Here, the catalyst was prepared by mechanical mixing and then subjected to thermal treatment at different temperatures (600–800 °C) to explore the underlying reasons. The thermal pre-treatment at temperatures higher than 600 °C can improve the catalytic activity of the mechanically mixed samples. The 700 °C-treated 5%BaMnO3-CeO2 sample shows the highest activity, with NO conversion to N2 of 13.4%, 40.6% and 57.1% at 600, 700, and 800 °C, respectively. Comparative activity study with different supports (ZrO2, TiO2, SiO2, Al2O3) reveals that CeO2 is indispensable for the high performance of a BaMnO3-CeO2 composite catalyst. The Ce species (mainly Ce3+) in CeO2 components diffuse into the lattice of BaMnO3, generating oxide ion vacancy in both components as evidenced by X-ray photoelectron spectroscopy and Raman spectra, which accelerates the rate-determining step and thus higher activity. The chemisorption results show that the interaction between BaMnO3 and CeO2 leads to higher redox activity and mobility of lattice oxygen. This work demonstrates that engineering the oxide ion vacancy, e.g., by thermal treatment, is an effective strategy to enhance the catalytic activity towards NO direct decomposition, which is expected to be applicable to other heterogeneous catalysts involving oxide ion vacancy.

Formation of environmentally friendly protective Ce2O3-CeO2 conversion coatings on Al, modified by phosphate layers: chemical and electrochemical characterization

Conversion ceria coatings were deposited on substrates of Al-1050 in a solution containing CeCl3×7H2O and CuCl2×2H2O. The post-treatment of as deposited coatings was realized in phosphate-containing solutions: 0.08 M Na3PO4 or 0.22 M NH4H2PO4. The XPS characterization of the surface of samples was carried out on an AXIS Supra electronspectrometer (KratosAnalytical Ltd.). The electrochemical investigations and determination of the basic corrosion parameters (Ecor, icor, Epit, EOCP, Rp, CR, etc.) for the studied systems were carried out on a Gamry Interface 1000 (EISSFR Analyzer EIS300). Based on the XPS investigations, it was ascertained that there is a substantial influence of the “pretreatment” and “post-treatment” operations on the chemical composition and chemical state of the elements on the samples` surface. It is expressed by a strong decrease in the concentration of Аl2O3 and Ce2O3+CeO2 components in the ceria coatings at the expense of formation of AlPO4 and AlOOH, CePO4, as well as PO3-, P2O5 and P4O10 compounds with Al and Се. The comparison of the results of Rp values and concentrations of Ce3+/Се4+, Al and P shows that the changes in Rp and quantity of Се4+ and P on the surface of the studied samples are directly related. The supposed and proved formation of low-soluble corrosion products on the surface of the studied systems and accomplished synergic effect of protective action by the formed cerium and aluminum oxides/phosphates layers determine the increase of the Rp and decrease of icor and CR, respectively. It was also concluded that the mixed conversion layers are a more effective barrier for the chloride ions diffusion to the metal surface and increase the corrosion resistance of Al 1050 to pitting and general corrosion.

Highly active and durable nitrogen-doped CoP/CeO2 nanowire heterostructures for overall water splitting

Developing high-efficiency, low-cost, and durable bifunctional electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is greatly desirable and challenging. Herein, a highly active and durable nitrogen-doped CoP coupled CeO2 nanowire heterostructure (N-CoP/CeO2) electrocatalyst is prepared on carbon cloth. The resultant N-CoP/CeO2 exhibits superb catalytic activities for OER and HER, featuring low overpotentials of 215 and 74 mV at 10 mA cm−2 in 1.0 M KOH. The N-CoP/CeO2 assembled water electrolyzer has super stability, which needs relatively low cell voltages of 1.52 V@10 mA cm−2 over 42 days (≈95.9 % retention) and 1.80 V@400 mA cm−2 over 21 days (≈94.4 % retention), outperforming most reported cost-effective electrocatalysts. Theoretical calculations reveal that the metallic heterostructure interfaces of N-CoP/CeO2 possess a fast electron transfer pathway, optimized adsorption/desorption process of reactive intermediates, and reduced reaction energetic barriers, thus enhancing the electrocatalytic activity. Additionally, the robust three-dimensional configuration and the oxygen vacancies-rich CeO2 component in N-CoP/CeO2 are regarded as significant contributors to improving stability and promoting long-term durability.

CeO2-modulated CoP derived from prussian blue analogue boosting hydrogen evolution reaction electrocatalysis

Molecular hydrogen has been considered as ideal energy carrier due to its high calorific value and clean product, which also requires eco-friendly generation process. Electrocatalytic H2 evolution from water splitting represents a compelling sustainable and green energy technology, but it is severely hindered by the large overpotential needed, especially for non-noble metal electrocatalysts. In this study, an interface engineering strategy is extended to improve the catalytic hydrogen evolution reaction (HER) performance of CoP by introducing CeO2 component. The novel heterostructure of CoP/CeO2 is successfully fabricated by a selective phosphidation treatment of pre-synthesized Co-PBA/CeO2 hybrid precursor. The introduced CoP/CeO2 hetero-interface would regulate the electronic structure, accelerate charge transfer and enhance the intrinsic activity of the active sites. By optimizing the content of functional CeO2 entity, the CoP/CeO2-2.5 is the most active electrocatalyst with the lowest overpotential of 152 mV to reach 10 mA cm−2 current in 1.0 M KOH, as well as a Tafel slope of 83.5 mV dec−1. Besides, CoP/CeO2-2.5 can also continuously operate well for more than 16 h, demonstrating the good durability of this electrocatalyst. This work would broaden the advanced HER electrocatalysts by fabricating hetero-interface with different functional components.

Formation/Decomposition of Li2O2 Induced by Porous NiCeOx Nanorod Catalysts in Aprotic Lithium-Oxygen Batteries.

To realize the utilization of high-performance lithium-oxygen batteries (LOBs), a rational-designed cathode structure and efficient catalytic materials are necessary. However, side products accumulated during battery cycling seriously affects the performance. Designing a cathode catalyst that could simultaneously facilitate the catalytic efficiency of the main reaction and inhibit the side reactions will make great sense. Herein, NiCeOx was proposed for the first time as a bifunctional cathode catalyst material for LOBs. The combined action of NiO and CeO2 components was expected to facilitate the decomposition of byproducts (e.g., Li2CO3), increase the oxygen vacancy content in CeO2, and enhance the adsorption of oxygen and superoxide. NiCeOx nanorods (NiCeOx PNR) were prepared using electrospinning method. It showed a hollow and porous nanorod (PNR)-like structure, which provided a large number of catalytic active sites and facilitated the transport of reactants and the deposition of discharge products. As a result, a high specific discharge capacity (2175.9 mAh g-1) and a long lifespan (67 cycles at 100 mA g-1 with a limited capacity of 500 mAh g-1) were obtained.

Highly efficient NO direct decomposition over BaMnO3-CeO2 composite catalysts

Developing high-performance catalyst is of paramount importance for NO direct decomposition. Here, composite catalysts BaMnO3-CeO2 were designed and prepared by the one-pot method, which show high catalytic activity, oxygen resistance and durability. The NO conversion to N2 of 85.9% at 800 °C is achieved over 5%BaMnO3-CeO2. It exhibits 66.5% activity in the presence of 10 vol% O2 and runs stable for more than 200 h in 5 vol% O2 at 800 °C. The high performance is originated from the strong interaction between BaMnO3 and CeO2 components, where CeO2 can effectively inhibit the sintering of BaMnO3 particles, enhance the redox activity, mobility of lattice oxygen and NO sorption. The proposed catalytic mechanism based on diffuse reflectance infrared Fourier transform spectroscopy and kinetic study reveals that the formation of N2O* intermediate species is the rate determining step. BaMnO3-CeO2 composite can be a promising catalyst candidate for NO direct decomposition.

Effect of pre- and post-treatment operations of aluminum alloy Al-1050 protected by ceria conversion coatings

This study aimed to elucidate the effect of “pre-treatment” and “post-treatment” operations on the corrosion resistance of ceria conversion coatings (CCOC) deposited on Al-1050. Based on the XPS data, it has been ascertained that there is a substantial influence of the phosphate post-treatments on the chemical composition and state of the elements on the surface of studied systems. The concentrations of Al2O3 and Ce2O3 + CeO2 components in CCOC are reduced at the expense of the formation of AlPO4 and AlOOH, CePO4 as well as PO3-, P2O5 and P4O10 compounds with Al and Ce. Electrochemical and XPS investigations revealed that these layers are a more effective barrier against diffusion of Cl− to the Al surface, increasing the resistance to the pitting and general corrosion.

Catalysts of ceria supported on copper-chromium oxide: Ceria promotion of the CO-PROX activity

A copper-chromium mixed oxide with Cu:Cr 1:2 ratio has been prepared by a microemulsion method and employed as support of CeO2 in different amounts from 5 to 80 wt%. The catalysts have been characterized by XRD, HRTEM/XEDS, H2-TPR and XPS. The characterization results have been examined in correlation with their catalytic properties for the CO-PROX process complemented by operando-DRIFTS. The catalysts are formed by composites of CuCr2O4 and CuO on which aggregates of CeO2 nanoparticles are dispersed. Incorporation of CeO2 onto the CuCr mixed oxide appreciably enhances the CO-PROX performance of the catalyst. This is related to a promotion of the generation and stabilization of active partially reduced copper sites during the course of the interaction of the catalysts with the reactant mixture and which are evidenced to be formed on both CuCr oxide and CeO2 components of the catalysts.

Pyrolysis Preparation Process of CeO2 with the Addition of Citric Acid: A Fundamental Study

CeO2 is an important energy storage material that can be used in solid fuel cells. Adding citric acid can improve the particle distribution of the pyrolytic preparation of CeO2 inside the reactor. Through Fluent, this paper investigated the pyrolysis preparation of CeO2 with the addition of citric acid by adopting the Eulerian multiphase flow model, component transportation model, and standard k-ε turbulence model. The experimental and simulation results suggest that the addition of citric acid can alter the pressure, temperature, and component distributions inside the reactor. When the mass fraction of O2 is 0.3, the concentration distribution effect of the CeO2 component is optimal and its conversation rate is the highest. When the mass fraction of citric acid is 0.04, the concentration distribution effect of the CeO2 component is the best, as witnessed by the high CeO2 concentration at the exit. It was found that an O2 content of 30 wt % and citric acid content of 4 wt % were optimal operating conditions for this technology.

Promotion of Phosphorus on Carbon Supports for MnOx−CeO2 Catalysts in Low‐Temperature NH3−SCR with Enhanced SO2 Resistance

AbstractMnOx−CeO2/P‐CA catalysts were prepared via incipient wetness impregnation of Mn(NO3)2 ⋅ 4H2O and Ce(NO3)3 ⋅ 6H2O over phosphorus‐doped carbon aerogels (P‐CA) for selective catalytic reduction of NO by NH3 (NH3−SCR). The results show that P doping on carbon support significantly promotes the NH3−SCR performance of MnOx−CeO2/P‐CA catalysts. P modification can improve the hydrophilicity of carbon support and facilitate the dispersion of MnOx−CeO2 components on carbon surface, which enhances the electronic interactions between MnOx and CeO2. The optimal catalyst 10 %MnOx−CeO2/P‐CA shows higher surface acidity, more Mn4+ and Ce3+, and a larger amount of surface chemisorbed oxygen (Oα) than that of 10 %MnOx−CeO2/CA catalyst. As a result, even though in the company of SO2, more NO can be adsorbed and oxidized over the 10 %MnOx−CeO2/P‐CA catalyst to generate more NO complexes, alleviating the suppression of SO2 on the SCR reaction via Langmuir‐Hinshelwood (L−H) mechanism, and thus the SO2 resistance is enhanced.

Fabrication of oxygen vacancy rich ultrafine ceria nanocubes decorated one dimensional CdS heteronanostructures for efficient visible light driven hydrogen evolution reaction

The fabrication of heterostructures is considered as a unique approach to realize the proficient charge separation and higher photocatalytic activity. Herein, we have successfully designed a Type-II heterostructured photocatalyst system based on CeO2 nanocubes anchored one dimensional CdS nanorods (1D CdS NRs) for visible photocatalytic H2 evolution reaction. Systematical characterizations including morphological, structural, optical and electrochemical measurements, firmly divulge the correlation between structures and photocatalytic activity of samples. The heterojunctions between nanorods and nanocubes result in the formation of CdS-CeO2 heteronanostructures (CdS-CeO2 HNSs) with unique band structures that lead to a Type-II heterojunction with efficient charge carriers’ separation. The optimized CdS-CeO2 HNS photocatalyst displays an excellent H2 evolution activity of 10.5 mmol/g/h and high stability. This superior performance is attributed to the efficient photoexcited charge carriers separation, suppressed recombination rate and strong hybridization between CdS and CeO2 components.

Monodisperse-porous cerium oxide microspheres carrying iridium oxide nanoparticles as a heterogeneous catalyst for water oxidation

Iridium oxide nanoparticle (IrO2 NP) decorated-monodisperse, porous CeO2 (IrO2@CeO2) microspheres were synthesized as a heterogeneous catalyst for chemical water oxidation with cerium ammonium nitrate (CAN) or sodium periodate (NaIO4) as the sacrificial agent. Before synthesis of the proposed catalyst, considerable oxygen evolution was observed using only plain CeO2 microspheres as the catalyst. Individual catalytic activity of plain CeO2 microspheres was explained by the formation of oxidative oxygen species due to the coexistence of Ce(III) and Ce(IV) ions on the surface as demonstrated by deconvoluted XPS analysis. Hence, CeO2 component of IrO2@CeO2 microspheres acted either support or active center. In other words, another active center, IrO2 NPs, was immobilized on the satisfactorily high surface area of porous CeO2 microspheres acted a support. IrO2@CeO2 microspheres with double catalytic active centers exhibited superior catalytic activity with respect to IrO2 NP decorated-porous SiO2 (IrO2@SiO2) microspheres due to the contribution coming from CeO2 microspheres. The maximum turnover number (TON) and turnover frequency (TOF) were obtained as 483 and 724 h−1 using CAN. By using IrO2@CeO2 microspheres as the catalyst, no significant decrease occurred in the oxygen evolution in the repeated runs with NaIO4 as the oxidant while the oxygen evolution apparently decreased using CAN.

Ultrafast Laser Manufacture of Stable, Efficient Ultrafine Noble Metal Catalysts Mediated with MOF Derived High Density Defective Metal Oxides.

Supported metal nanoparticles (MNPs) undergo severe aggregation, especially when the interaction between MNPs and their supports are limited and weak where their performance deteriorates dramatically. This becomes more severe when catalysts are operated under high temperature. Here, it is reported that MNPs including Pt, Au, Rh, and Ru, with sub-2 nm size can be stabilized on densely packed defective CeO2 nanoparticles with sub-5 nm size via strong coupling by direct laser conversion of corresponding metal ions encapsulated cerous metal-organic frameworks (Ce-MOFs). Ce-MOF serves as an ideal dispersion precursor to uniformly encapsulate noble metal ions in their orderly arranged pores. Ultrafast laser vaporization and cooling forms uniform, ultrasmall, well-mixed, and exceptionally dense nanoparticles of metal and metal oxide concurrently. The laser-induced ultrafast reaction (within tens of nanoseconds) facilitates the precipitation of CeO2 nanoparticles with abundant surficial defects. Due to the well-mixed ultrasmall Pt and CeO2 components with strong coupling, this catalyst exhibits exceptionally high stability and activity both at low and high temperatures (170-1100 °C) for CO oxidation in long-term operation, significantly exceeding catalysts prepared by traditional methods. The scalable feature of laser and huge MOF family make it a versatile method for the production of MNP-based nanocomposites in wide applications.

Dual-site activation enhanced photocatalytic removal of no with Au/CeO2

Photocatalytic technology provides an effective strategy for aerobic purification of dilute gaseous NO pollutant, but suffers from its low efficiency. In this study, we demonstrate that the bicomponent Au/CeO2 photocatalyst possesses an enhanced photocatalytic NO removal performance under visible light irradiation, with a higher NO conversion efficiency (65%) and triple rate constant (0.1451 min−1) versus CeO2 (50%, 0.0448 min−1). Density function theory calculations and experimental results revealed that oxygen vacancies on the CeO2 component could favorably initiate the adsorption and activation of O2 to generate O2−, simultaneously, Au nanoparticles loaded on the CeO2 surface were active centers for adsorption and activation of NO to produce NO+ by plasmonic holes of the Au under visible light irradiation. Subsequently, these O2− and NO+ species generated via dual-site activation pathway on Au/CeO2 photocatalyst reacted spontaneously to generate the final NO3−, leading to enhanced photocatalytic removal of NO. This study sheds light on a dual-site induced photocatalytic NO oxidation and advances the design of effective air purification photocatalyst.